200即是收到。GET回调 Content-Type: application/x-www-form-urlencodedt + tradeNo + orderNo + currency + amount + status + code + message1728641570974pay_uPg7EbJzqOa1LfqEa8uEasd60102USD12.342succeededsucceededSHA256算法加密签名字符串,例如加密第2步准备的字符串后的字符串为:232d51ff064fcebe8e5e6931a7369d1cb6c88420a8b53713591ab10273240499